As I said a zygote is the result of the union of the egg and the sperm. It develops into a fetus and remains a fetus until birth at which time it is no longer a fetus but a baby. Surely, you can understand that.
By declaring an unborn human being in a state of "fetus-hood" you try to deny humanity to that human just as slave owners did by declaring their slaves were not full humans under law and therefor not due full rights, as I already pointed out.
And as I also noted that places you in agreement with the slave masters of the old antebellum South who also felt that slaves were not really people and did not really deserve the full rights any human being might otherwise enjoy.
I could also easily lump you together with the Nazis, who didn't think Jews were truly human, Turks who felt the same about Armenians and Stalin who thought Slavs were subhuman. You get the idea. You are on the dark side of history.